Burring attachment for drills



BURRING ATTACHMENT FOR DRILLS Filed July 1, 1943 JUIQA- INVENTOR.

aw EGVMWW Patented Feb. 8, 1944 ijNiTEfi snares Parana or ies 4 Claims.

The object of this invention is to provide a burring attachment for drills which is characterized by a; simple inexpensive construction which does not include any specially made chucks or other elaborate devices for securing the cutting tool to the drill. The invention is embodied in such a simple practical and efiicient device that it may be made and used with a minimum of expenditure of material and labor. In the accompanying drawing illustrating the invention Fig. l is a side view of the attachment.

Fig. 2 is a central vertical sectional view thereof.

Fig. 3 is a plan view. Fig. 4 shows the burring attachment mounted in operative position on a drill.

Figs. 5 and 6 illustrate a modification in side view and plan view, respectively.

The burring attachment according to this invention consists of a tool holder 7 which is nothing but a short piece of tubing cut to a suitable length. It may be cut from a standard sized tubing so that the hole 8 will fit standard size drills. While this involves having a graded set of attachments to fit graded sets of drills, this is not believed to be a disadvantage because it is quite common to have graded sets of tools for diflerent purposes. Then again, the attachment is so quickly made that diiferent sizes can be made from time to time and thus after a while be collected into a complete set.

The bottom of the holder may be formed with a reaming head ID for smoothing the edge of the drilled hole after the burr has been removed if it should be'desired. The head I also serves as a centering device. The tool l2 for cutting away the burr from the edge of a drilled hole is made from a standard size rod and is then ground at any desired angle to form the cutter l3. A hole I4 is drilled through the holder at an angle to its central axis. The tool is inserted into the hole and held in adjusted position by a set screw I 5. The tool l2 projects above the holder to form a gripping portion as shown for convenience in adjusting the tool.

When a burr is to be removed the attachment is pushed from below into position on the drill, the cutter l3 following the groove in the drill like a screw being screwed on as will be understood. When the cutter I3 is at the proper height the set screw I is tightened and the tool is ready to be used. As the drill is rotated the cutter i3 is lowered onto the drilled hole and cuts the burr at the upper edge of the hole. The reaming head It! further smoothes the edge.

Figs. 5 and 6 show a burring attachment in which the holder is made in two halves l5 and l! whereby the central bore I 8 is adjustable to fit drills of dlfierent diameters. Set screws l9, l9 serve to clamp the holder to the drill. The tool it with cutter i3 is similar to that described above.

The attachment as herein disclosed is characterized by extreme simplicity and low cost of manufacture. It may be quickly made from standard size pieces in a machine shop. The tool cutter is easily adjusted to the proper cutting height because the cutter i3 is visible at all times and the operator takes hold of the upper projecting end of the tool H2 in making the adjustment.

I claim:

1. A burring attachment for drills comprising a holder having a. central bore clear through the same adapted to receive the drill, a set screw in the holder for adiustably and detachably securing the attachment to the drill, said holder having a bore passing clear through the holder and inclined at an angle to the axis of the holder towards the bottom thereof, a tool in said in-- clined bore and a set screw in the holder for adjustably and detachably securing the tool in the holder, the bottom of said tool forming a cutter below said holder and adapted to project into the groove of the drill.

2. A burring attachment according to claim 1 including a tool of greater length than the said inclined bore, the upper end of the tool projecting above the said holder to form a gripping portion to facilitate the adjustment of the cutter formed on said tool.

3. A burring attachment according to claim 1 including a reaming head on the bottom of the said holder.

4. A burrlng attachment for drills comprising a holder having a central bore clear through the same for attachment to a drill, screw means in said holder for securing the same to the drill, a bore in said holder inclined towards the axis of the holder at the bottom thereof, a cuttingtool in said inclined bore and projecting at both ends thereof and a set screw for securing said cutting tool in the said inclined bore in axial adjustable relation to the said holder.

ELMER. C. DIETZ. 

